Mattermost

Name: Mattermost
Availability: InStock
Rating: 4.22857141494751 (20292 reviews)
Author: Mattermost

20.3K reviews

Rated for 3+

1M+

Downloads

Rated for 3+

Users Interact

Learn more

About this app

Requires Mattermost Server v11.7.0+. Older servers may not be able to connect or have unexpected behavior.

-------

Mattermost is secure workplace messaging from behind your firewall.

- Discuss topics in private groups, one-to-one or team-wide
- Easily share and view image files
- Connect in-house systems with webhooks and Slack-compatible integrations

To use this app, you need a URL for a Mattermost server.

-------

Host your own server: https://about.mattermost.com/download

Terms of Service: http://about.mattermost.com/terms/

Contribute to the project: https://github.com/mattermost/mattermost-mobile

Secure, self-hosted workplace messaging

Updated on

Oct 27, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.

No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Messages and 3 others
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

19.7K reviews

Markus Deutsch

November 2, 2026

Randomly signs me out and forgets my server (fun, always typing that in), and shows stale channel contents. Swiping up to refresh also doesn't seem to work, or at least the data does not update.

Yooo

July 20, 2026

This is a very bad app that I would never use if I didn't have to. It is the most unusable and user-unfriendly messenger app I have ever seen. It always crashes on mobile devices and often fails to update new messages properly. There is a high chance that if you make a mistake, the app will crash and won't let you fix it. The UI/UX is terrible. With the latest update, you can't even open threads anymore. Thank you for creating such an app and making us want to switch to another platform.

3 people found this review helpful

Michael Lam

September 10, 2026

All my channels says it is read-only. if I could give a 0 star, I would. Stuck at "Authentication Successful, signing in now, just a moment" screen forever. Web version signs in right away after SSO.

Mattermost

February 26, 2024

Hi there, can you help with more details on reproduction steps? Feel free to open a new issue with details at https://github.com/mattermost/mattermost-mobile/issues.